Moldboard



1,691,561 W. L. BEALL I MOLDBOARD Filed Sept. 4, 1924 17711675207;zijzlzam/Lfieab,

I Nov. 13,. T528.

Patented Nov. 13, 1928.

UNITE!) STA-TEST.

PATENT OFFICE.

WILLIAM LEsnIn BEALL, or. CHATTANOOGA, TENNESSEE, AssIoNoR T0 mum.

TIONAL HARVESTER COMPANY, or CHICAGO, ILLINOIS, A CORPORATIONOF NEWJERSEY.

QMOLDBOARD.

Application filed September 4, 1924 Serial No. 735,?35:

This invention relates to cast metal plow moldboardsof the kind'having achilled face or working surface and a comparativelysoft metal back.- p Iy o The objects of the invention are to provide against the warpingstrains which tend to,

ribs and grooves extending longitudinally of the board, as hereinaftermore particularly described and claimed.

In the accompanying drawings,

Fig. 1 is a back View of a moldboard embodying the improved features ofconstruction comprising the invention; and

Fig. 2is a section on line 2-2 of F ig. 1. V

The moldboard illustrated is of conventional form and has twoangularlyrelated forward edges 5 and 6 adapted to engage the shin andblade ofthe plow-point or share, which edges will be hereinafterreferred to as the connecting edges of the moldboard, and upper andlower longitudinal or free edges 7 and 8 which come together in therounded end of the moldboard 9. The usual openings for attaching boltsare. shown at 10.

Y In the preferred form of the invention, the under side of themoldboard is fitted with a succession of closely spaced grooves 11 whichseparate ridges 12 of substantialy the same width as the grooves. Thegrooves originate or begin adjacent the connecting edges 5 and 6 of themoldboard. The three lower grooves begin adjacent the lower end of theshare engaging edge of the board as at 13, while the remaining groovesbegin adjacent the shin engaging edge 5. Certain of these grooves,indicated at 14, run parallel to the share engaging edge 6 down to thepoint of origin of grooves 13, after which they continue parallelthereto. The arrangement of the grooves is such that they extendlongitudinally of the board in parallel relation to each other and tothe upper and lower free edges thereof merging in the longitudinalmedian line of the moldboard, as clearly illustrated in Fig. 1. As anadditional reinforcing element the lower longitudinal free edge of themoldboard is preferably formed with a rearwardly projecting marginalflange 15, as. shown in Fig. 2. v i

. This provides a construction in which the entire area of the underside of the moldboard is formed with longitudinally extending alternategrooves and ridges which conform to the contour of the longitudinaledges of the moldboard, the thickness of suchv a board when measuredthrough the ridges being no greater than that of an old type of moldboard having a plain back. Thus it will be seen that a board formedaccording to the invention herein disclosed will be lighter or composedof less metalthan a similar board of the old type, resultingin economyof manufacture without sacrifice of strength, as it has been found thatthe strains tending to crack a moldboard during cooling will acttransversely across the board and, forming and arranging grooves on theback of the board in the manner herein described, will effectivelyresist the action of such strains while permitting employment of lessmetal as above stated. As a large proportionof the area of.

the moldboard (that occupied by the grooves) is thinner than in the caseof moldboards made of uniform thickness, the face of the board will takea harder chill and be correspondingly more efiicient in scouring.

While thespecific arrangement of grooves above described represents thepreferred em bodiment of the invention, it will be evident to thoseskilled in the art that certain variations from the pattern shown may bemade tion as defined in the following claims.

WVhat is claimed is:

1. A cast metal moldboard having its rear or under side formed with aplurality of longitudinally extending grooves, said grooves being formedin series paralleling the free edges thereof.

2. A cast metal moldboard having its rear or under side formed with aplurality of longitudinally extending grooves paralleling the free edgesthereof and merging in its longitudinal median line.

3. A cast metal moldboard having its rear or underside formed with asuccession of parallel grooves conforming to the contour of the freeedges thereof, said grooves originating adjacent the connecting edges ofthe moldboard.

4:. A cast metal moldboard having the enwithout departing from the gistof the inventire area of its rear or underside formed with a succession.of closely spaced parallel grooves conforming to the contour of the freeedges-thereof, said grooves originating.

adjacent the connecting edges of the moldboard and merging at itslongitudinal me;

dian line.

5. A cast metal moldboard having two angularly related connecting edgesand longitudinal free edges merging into a rounded upper end, and havingits rear or under side formed with successive closely spaced'continuousparallel grooves running parallel to the free edges of the moldboardandmerging at its longitudinal median line, the grooves originatingadjacent said connecting edges and certain of said grooves runningparallel to one connecting edge.

6. cast metal mold board having its rear or under side Iornied w th asuccession of parallel longitudinal extending grooves and with amarginal flange projecting rearwardly from its lower longituidnal freeedge.

7. A cast metal inoldboard having two se-' ries of substantiallyparallel continuous ribs on its under side, corresponding ribs of theseparate series diverging forwardly flOl'l'l ing the ribs of the lowerseries at positions] which aresubstantially al gned and in the verticalmedi an line of the moldboard. 9. A moldboardhaving its under surfaceprovided with a plurality of pairs of for} wardly diverging continuousribs.

10. A moldboard having its unoer surface positions'near the longitudinalmedian line of the moldboard.

provided with a plurality of series or substantially parallel ribs, theribs oi" the'separate series being substantially parallel to lines whichdiverge forwardly of the niold board. 7

In testimony whereofI aflix my signature;

WILLIA LESLIE B A I

